Leveling Question

Ok guys heres the deal. I bought my truck used with 285/70/17's, is my truck leveled? I always read on here about people saying you cant go bigger than 265's, so thats why i have this question. My truck looks pretty level, but i put a full replacement front bumper on it, so it kinda looks a little lower in the front. It rides good, but i dont know how it rode from the factory.